Insomnia is a clinical sleep disorder characterized by persistent difficulty falling asleep, staying asleep, or waking up too early, despite having an adequate opportunity to sleep.

To be medically defined as an insomnia disorder, the sleep disturbance must cause significant daytime impairment, such as fatigue, irritability, or difficulty concentrating.

Clinical Criteria for Diagnosis

 The American Academy of Sleep Medicine and Medical professionals, including those following DSM-5-TR guidelines, typically diagnose insomnia based on these factors:

  • Sleep Symptoms: Difficulty initiating sleep, frequent nocturnal awakenings, or inability to return to sleep after waking too early.
  • Adequate Opportunity: The individual must have a safe, quiet environment and enough time set aside for sleep, distinguishing insomnia from simple sleep deprivation.
  • Daytime Impact: The lack of sleep results in functional issues like mood disturbances, reduced work performance, or “orthosomnia” (preoccupation with sleep).

Types of Insomnia by Duration

Insomnia is primarily categorized by how long the symptoms persist:

Acute (Short-term) Insomnia: Often triggered by a life stressor (e.g., job loss or grief), this lasts for a few days or weeks but less than 3 months.
Chronic (Long-term) Insomnia: Diagnosed when sleep difficulties occur at least 3 nights per week for a period of 3 months or more.

Substance Abuse and Insomnia

While substance-induced insomnia often starts as a short-term (acute) condition during active use or withdrawal, it frequently becomes long-term (chronic) and can persist for months or even years after quitting.

Short-Term vs. Long-Term Duration

Acute Phase (Short-Term): Sleep disturbances are most intense during the first few days to weeks of abstinence. For many substances, this “withdrawal insomnia” typically lasts 2 to 8 weeks as the body attempts to reset its sleep-wake cycle.
Chronic Phase (Long-Term): Insomnia is considered chronic if it lasts 3 months or more. Studies show that between 25% and 72% of people in recovery experience persistent sleep issues that can last well beyond the initial detox period.

Typical Timelines by Substance

The recovery of natural sleep rhythms varies depending on the substance used:

Alcohol: Often 2–6 weeks but can persist for 1–2 years in cases of severe dependence due to Post-Acute Withdrawal Syndrome (PAWS).
Stimulants (Cocaine/Meth): Generally, 1–4 weeks.
Cannabis: Typically, 2–4 weeks, though it is often cited as the most distressing symptom of marijuana withdrawal.
Benzodiazepines: Can last months and often requires a medically supervised gradual taper.

Why It Persists and Treatment

According to the National Institute of Health, substance abuse can cause semi-permanent changes to the brain’s “regulatory systems” and neurotransmitter levels (like dopamine), which are responsible for maintaining a healthy circadian rhythm. Because persistent insomnia is a leading predictor of relapses, medical professionals often recommend targeted treatments.

Here at Primary Addiction Medicine Care of Connecticut, we understand that sleep needs to be addressed.

Especially because Insomnia significantly increases the risk of relapses for both substance addiction and mental health disorders, acting as a “universal risk factor”. It causes chronic stress, impairs decision-making, and triggers cravings, with studies showing individuals in early recovery with insomnia are much more likely to return to substance use.

Treatment can consist of choosing from various classes of over the counter and/or prescription medication based upon the patient’s past medical history, co-morbidities, current medication regimen, polypharmacy review, and stage in substance abuse and/or recovery.

Classes of Sleep Medication

Medications for sleep are classified by how they interact with the brain’s sleep-wake systems. Major classes include those that enhance “calming” signals (GABA), those that block “wakefulness” signals (Orexin/Histamine), and those that mimic natural sleep hormones (Melatonin).

Prescription of Sedative-Hypnotics (GABA-Targeted)

These are the most common sleep medications. They work by enhancing GABA, a neurotransmitter that slows brain activity.

Z-Drugs (Non-benzodiazepines): These are highly selective for sleep receptors and are often first-line treatments for insomnia.
Examples: Zolpidem (Ambien), Eszopiclone (Lunesta), and Zaleplon (Sonata).

Benzodiazepines: An older class that also reduces anxiety. They are generally for short-term use due to risks of addiction and dependence.
Examples: Temazepam (Restoril), Triazolam (Halcion), and Etizolam.

Dependence Potential: Controlled substances by Schedule of DEA and therefore prescribing needs to be done responsibly

Orexin Receptor Antagonists (ORAs)

A newer class that works differently by blocking orexin, a chemical that promotes wakefulness. Instead of “forcing” sleep, they “silence” the brain’s wake system.

Examples: Suvorexant (Belsomra), Lemborexant (Dayvigo), and Daridorexant (Quviviq).

Melatonin Receptor Agonists

These mimic the natural hormone melatonin to help regulate the sleep-wake cycle (circadian rhythm). They have a lower risk of dependence than sedative-hypnotics.

Examples: Ramelteon (Rozerem) and Tasimelteon (Hetlioz).

Antidepressants (Off-Label or Approved)

Some antidepressants are used because of their sedating side effects, often related to blocking histamine or serotonin.

FDA-Approved for Insomnia: Doxepin (Silenor) is specifically approved in low doses for sleep maintenance.
Off-Label: Often prescribed when insomnia occurs alongside depression or anxiety.
Examples: Trazodone, Mirtazapine (Remeron), and Amitriptyline.

Over the Counter (OTC) Sleep Aids

Antihistamines: Most OTC sleep aids contain first-generation antihistamines that cause drowsiness by blocking histamine.
Examples: Diphenhydramine (Benadryl, ZQuil) and Doxylamine (Unisom).
Melatonin Supplements: Synthetic versions of the body’s natural sleep hormone.

Barbiturates (Rarely Used)

Once the standard for sleep, they are now rarely used for insomnia because of high toxicity and risk of fatal overdose.

Examples: Butobarbital (Butisol) and Secobarbital (Seconal)

Psychiatric mood stabilizers, atypical anti-psychotics

Seroquel is an atypical antipsychotic often used “off-label” to treat insomnia due to its strong sedative effects, usually acting within 1–2 hours.  Effective in providing sleep and calming mood effect and can be used in active addiction, acute withdrawal, or early recovery.  Pro: Very low dependence or addiction potential.

Key Considerations for Seroquel for Sleep:

How it works: At lower doses, it acts as a strong antihistamine and blocks serotonin 5-HT2C receptors, leading to sedation.
Benefits: It can be effective for sleep disorders related to bipolar disorder or depression and can “calm the noise” in the brain.